A kind of double modified high nickel ternary material and preparation method thereof

A high-nickel ternary material, high-nickel technology, applied in electrical components, active material electrodes, positive electrodes, etc., can solve the reduction of discharge specific capacity, but not fundamentally solve the residual alkali content and cycle performance of high-nickel ternary materials. Deterioration and other problems to achieve the effect of slowing down side reactions, reducing surface residual alkali content, and reducing surface activity

Active Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, washing with water will make more active Li + It is detached from the material lattice, resulting in a decrease in the specific discharge capacity of the material and poor cycle performance; although the coating of an inorganic inert material helps to improve the cycle performance, it does not change the Ni on the surface of the high-nickel ternary material. 3+ Therefore, it has not fundamentally solved the problem of high residual alkali content of high-nickel ternary materials

Method used

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  • A kind of double modified high nickel ternary material and preparation method thereof
  • A kind of double modified high nickel ternary material and preparation method thereof
  • A kind of double modified high nickel ternary material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Weigh 100.00g of Ni according to the molar ratio of n(Li):n(Ni+Co+Mn+Zr)=1.02 0.8 Co 0.1 Mn 0.1 (OH) 2 Precursor and 46.87 g of LiOH·H 2 The mixture was ball-milled and mixed for 3 hours to obtain a mixture. The mixture was put into an alumina crucible, placed in an atmosphere furnace, and calcined at 750° C. for 20 hours under an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325-mesh sieve to obtain High nickel ternary base material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811);

[0050] (2) Weigh 99.00g of the NCM811 base material of step (1) and 1.00g of nano-ZrO 2 , mixed with a high-efficiency mixer for 10 min to obtain ZrO 2 Coated high nickel ternary material;

[0051] (3) the ZrO obtained in step (2) 2 The coated high-nickel ternary material was calcined at 750 °C for 3 hours in an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325-mesh sieve to obtain Li 2 N...

Embodiment 2

[0053] (1) Weigh 100.00g of Ni according to the molar ratio of n(Li):n(Ni+Co+Mn+Zr)=1.05 0.8 Co 0.1 Mn 0.1 (OH) 2 Precursor and 48.72 g of LiOH H 2 The mixture was ball-milled and mixed for 3.5h to obtain a mixture. The mixture was put into an alumina crucible, put into an atmosphere furnace, and calcined at 780°C for 6h under an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325 mesh sieve. Obtained high nickel ternary base material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811);

[0054] (2) Weigh 97.00g of the NCM811 base material of step (1) and 3.00g of nano-ZrO 2 , mixed with a high-efficiency mixer for 40min to obtain ZrO 2 Coated high nickel ternary material;

[0055] (3) the ZrO obtained in step (2) 2 The coated high-nickel ternary material was calcined at 750°C for 10 hours in an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325-mesh sieve to obtain Li 2 NiZrO 4 Doubl...

Embodiment 3

[0057] (1) Weigh 100.00g of Ni according to the molar ratio of n(Li):n(Ni+Co+Mn+Zr)=1.06 0.9 Co 0.05 Mn 0.05 (OH) 2 Precursor and 49.45 g of LiOH H 2 The mixture was ball-milled and mixed for 3 hours to obtain a mixture. The mixture was put into an alumina crucible, placed in an atmosphere furnace, and calcined at 700° C. for 15 hours under an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325 mesh sieve to obtain High nickel ternary base material LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM955);

[0058] (2) Weigh 97.00g of NCM955 base material of step (1) and 5.00g of nano ZrO 2 , mixed with a high-efficiency mixer for 60 min to obtain ZrO 2 Coated high nickel ternary material;

[0059] (3) the ZrO obtained in step (2) 2 The coated high-nickel ternary material was calcined at 650 °C for 8 hours in an oxygen atmosphere. After the material was cooled, the material was crushed and passed through a 325-mesh sieve to obtain Li 2 N...

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Abstract

The invention belongs to the field of positive electrode materials for lithium ion batteries, and discloses a double-modified high-nickel ternary material and a preparation method thereof. The method includes: (1) first calcining a mixture containing a high-nickel ternary precursor and a lithium salt to obtain a high-nickel ternary base material; (2) mixing the high-nickel ternary base material with nano-ZrO 2 mixed to obtain ZrO 2 Coated high nickel ternary material; (3) the ZrO 2 The coated high-nickel ternary material is subjected to a second calcination to obtain Li 2 NiZrO 4 Double-modified high-nickel ternary materials with cladding and subsurface doping of Zr. The method provided by the invention effectively reduces the surface activity of the ternary material, thereby reducing the residual alkali content on the surface of the material and improving the cycle performance of the ternary material.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a double-modified high-nickel ternary material and a double-modified high-nickel ternary material prepared by the method. Background technique [0002] Due to the advantages of high energy density, good cycle performance, and no memory effect, lithium-ion batteries have been widely used in small consumer electronics fields such as mobile phones and notebook computers, as well as large power batteries such as electric bicycles, electric vehicles, wind power & photovoltaic energy storage. and energy storage power. [0003] With the promotion of new energy vehicles, power lithium-ion batteries have been greatly developed. Despite the high energy density of lithium-ion batteries, lithium-ion battery electric vehicles still have the shortcoming of short driving range, which also seriously restricts their large-scale applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/362H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 李刚戴仲葭杜泽学宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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